No is its past tense, no = no. Note: do is the third form of do. The same: not done = not done, should not = should not = should not = will not.
Extended data:
Common abbreviated forms and complete forms
In fact, abbreviations abound in English. At first, abbreviations were shortened and omitted from longer English words or phrases for convenience. It is characterized by loyalty to the original text, without changing the theme or central idea of the original text or changing the outline of the original text. At the same time, after the abbreviation, make sure that the word will not be distorted or the abbreviation will become another word.
Some abbreviations and complete forms in primary school English;
I am = I am.
he is
she is
Yes = yes
That's = that's
What is what
let us
We = us
They are = they are.
You are = you are.
Cannot = cannot.
Cannot = cannot.
Shouldn't = shouldn't
No = no
I will
we will
No = don't
No = no
None = none
It has = it has.
I have
not yet
not yet
No = no
No = no
Want = want
Plan = plan